Honeywell HC900 - Manual (Page 63)

Revision 10 HC900 Hybrid Controller Communications User Guide 55
12/07
6.6 Variables
Summary
Variables (analog or digital) are writeable parameters in HC900 attached to input pins of function blocks.
Digital Variable status is also represented in floating point: 0.0 for OFF or logic 0 and 1.0 for ON or logic
1. The Variable number in the table corresponds to the Variable number in the HC900 configuration.
You will need to access the HC900 Hybrid Control Designer configuration or corresponding configuration
printout of Tag Information Report to identify the Variable numbers desired.
Single byte writes are permitted to digital variables. A non-zero will automatically set the digital variable
to a floating point 1 and a zero write to a single register will set the digital variable to 0.
Function Code Support:
Read – Function Code 3
Write – Function Codes 6 (digital variables only), 16 (10 Hex)
The addresses given in Table 6-5 do not necessarily apply to variables in the custom map. For custom
addresses view or print a report in HC Designer.
Table 6-5 Variables
Fixed
Address
(hex) Fixed
Register
(decimal) Parameter Access Notes
18C0 6337 Variable Value #1 R/W Floating Point in Engineering Units.
18C2 6339 Variable Value #2 R/W
18C4 6341 Variable Value #3 R/W
18C6 6343 Variable Value #4 R/W :
18C8 6345 Variable Value #5 R/W :
18CA 6347 Variable Value #6 R/W :
18CC 6349 Variable Value #7 R/W :
18CE 6351 Variable Value #8 R/W :
18D0 6353 Variable Value #9 R/W :
18D2 6355 Variable Value #10 R/W :
18D4 6357 Variable Value #11 R/W :
18D6 6359 Variable Value #12 R/W :
18D8 6361 Variable Value #13 R/W :
18DA 6363 Variable Value #14 R/W :
18DC 6365 Variable Value #15 R/W :
18DE 6367 Variable Value #16 R/W :
18E0 6369 Variable Value #17 R/W :
18E2 6371 Variable Value #18 R/W :
18E4 6373 Variable Value #19 R/W :
18E6 6375 Variable Value #20 R/W :
: : : :
1D6E 7535 Variable Value #600 R/W :